CN217928734U - Condensed water supply system of nuclear power station - Google Patents
Condensed water supply system of nuclear power station Download PDFInfo
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- CN217928734U CN217928734U CN202221551840.3U CN202221551840U CN217928734U CN 217928734 U CN217928734 U CN 217928734U CN 202221551840 U CN202221551840 U CN 202221551840U CN 217928734 U CN217928734 U CN 217928734U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The utility model belongs to the technical field of the operation is optimized, a nuclear power station condensate water supply system is disclosed, it includes condenser, the female pipe of export to and through three condensate pump of pipeline parallel connection between condenser and the female pipe of export, wherein, every condensate pump's delivery port is equipped with the check valve, is connected with the pipeline of filling water on the pipeline between the delivery port of check valve and condensate pump. Compared with the prior art, the utility model discloses among the nuclear power station condensate water supply system, the pipe connection between check valve and condensate pump's the delivery port has the water filling pipeline, fills the water piping connection export female pipe and/or conventional island demineralized water distribution system network management, and after the check valve upper reaches got into the air, the accessible was filled the water piping and is filled the water operation, guarantees that the condensate pump is full of water and starts, can reduce the vibration and the oxidation corrosion of condensate pump outlet pipe way, avoids the pipeline to break.
Description
Technical Field
The utility model belongs to the technical field of the operation optimization, more specifically say, the utility model relates to a nuclear power station condensate water supply system.
Background
The condensed water supply system of the nuclear power plant is positioned at the initial part of a two-loop cycle and is an important component of a main thermal cycle of a steam turbine. The condensate water supply system of the nuclear power station is generally provided with three condensate pumps (caisson type vertical three-stage centrifugal pumps), under normal working conditions, two condensate pumps run, one condensate pump is reserved, the exhaust steam of a low-pressure cylinder is condensed into water in a condenser, and the water is pumped by the condensate pump and then is sent to downstream users through check valves of respective outlets.
Since the condenser is at a high vacuum, to prevent condensate pump cavitation, the level of the first stage impeller of the condensate pump must be of sufficient depth so that the actual net positive suction head of the condensate pump is higher than the required net positive suction head. Under normal conditions, when the condensate pump is stopped for standby, the upstream of the outlet check valve is in a vacuum negative pressure state of the condenser, and the downstream of the outlet check valve is in a positive pressure state after the condensate pump is stopped for standby. However, in practical application, the sealing problem of flange, mechanical seal, pump export instrument pipeline etc. can be imported and exported because of maintenance or pump, lead to check valve upstream pipeline to get into the air, influence condensate pump's start blocking signal: on one hand, water hammer is generated in the pipeline at the moment of starting the pump, the pipeline vibration is intensified, and even water leakage caused by pipeline breakage can possibly occur to cause the low water level of the deaerator; on the other hand, oxygen-containing water enters a downstream pipeline, and the scouring corrosion of the carbon steel pipeline is aggravated.
In view of the above, it is necessary to provide a condensate supply system for a nuclear power plant, which can ensure full-water startup of a condensate pump.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an: the condensate water supply system of the nuclear power station can be used for overcoming at least one defect in the prior art and ensuring that a condensate pump is started in full water.
In order to realize the above-mentioned purpose, the utility model provides a nuclear power station condensate water supply system, it includes condenser, the female pipe of export to and through pipeline parallel connection in three condensate pump between the female pipe of condenser and export, wherein, the delivery port of every condensate pump is equipped with the check valve, the check valve with be connected with the pipeline of filling water on the pipeline between condensate pump's the delivery port.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, three fill water line and all connect the female pipe of export.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, three fill water line and all connect conventional island demineralized water distribution system network management.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, three the water filling line is connected respectively the female pipe of export and conventional island demineralized water distribution system network management.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, three the water filling line is connected respectively the female pipe of export and conventional island demineralized water distribution system network management.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, be equipped with the pneumatic valve on every water filling line.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, the pneumatic valve with be equipped with liquid level alarm device on the water filling line between condensate pump's the delivery port.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, the pneumatic valve normally is the off-state, the pneumatic valve is in open after the liquid level alarm device reports to the police.
According to an embodiment of the condensate supply system of the nuclear power plant, the water filling line is made of stainless steel.
According to the utility model discloses an embodiment of nuclear power station condensate water supply system, condensate pump is the vertical tertiary centrifugal pump of caisson type.
Compared with the prior art, the utility model discloses among the nuclear power station condensate water supply system, the pipe connection between check valve and condensate pump's the delivery port has the water filling pipeline, fills the water piping connection export female pipe and/or conventional island demineralized water distribution system network management, and after the check valve upper reaches got into the air, the accessible was filled the water piping and is filled the water operation, guarantees that the condensate pump is full of water and starts, can reduce the vibration and the oxidation corrosion of condensate pump outlet pipe way, avoids the pipeline to break.
Drawings
The following detailed description of the condensed water supply system and its technical effects in the nuclear power plant will be made with reference to the accompanying drawings and specific embodiments, in which:
fig. 1 is a schematic structural diagram of a first embodiment of a condensate supply system of a nuclear power plant according to the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the condensate water supply system of the nuclear power plant according to the present invention.
Fig. 3 is a schematic structural view of a third embodiment of the condensate supply system of a nuclear power plant according to the present invention.
Wherein:
10- -a condenser; 20- -outlet header; 30- -condensate pump; 300- -check valve; 40- -water filling line; 400- -pneumatic valve; 402- -liquid level alarm device; 404- -manual valve; 50- -SER pipe network.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and not limitation.
Referring to fig. 1 to 3, the present invention provides a condensate water supply system for a nuclear power plant, which includes a condenser 10, an outlet main pipe 20, and three condensate pumps 30 connected in parallel between the condenser 10 and the outlet main pipe 20 through pipes, wherein a check valve 300 is disposed at a water outlet of each condensate pump 30, and a water filling pipe 40 is connected to the pipe between the check valve 300 and the water outlet of the condensate pump 30.
Please refer to fig. 1 in particular, which is a schematic structural diagram of the first embodiment of the condensate supply system of the nuclear power plant of the present invention, which includes a condenser 10, an outlet main pipe 20, and three condensate pumps 30 connected in parallel between the condenser 10 and the outlet main pipe 20 through pipes, wherein a check valve 300 is disposed at a water outlet of each condensate pump 30, and the pipes between the check valve 300 and the water outlet of the condensate pump 30 are connected to the outlet main pipe 20 through a water filling pipe 40.
It should be noted that, in order to ensure the safe operation of the condensate supply system of the nuclear power station, according to the preferred embodiment of the condensate supply system of the nuclear power station of the present invention, the water quality of the water filling line 40 is the qualified condensate after the primary deoxidization of the condenser. The water filling pipeline 40 is made of stainless steel, so that the scouring of water flow can be reduced, and the corrosion of the inner wall of the pipeline can be reduced. The water charging line 40 can adopt a small pipe diameter of phi 25mm to avoid the shunting effect on the flow of the main pipeline, and the shunting effect can reduce the outlet pressure of the condensate pump, so that a trip signal of the condensate pump is generated.
In the first embodiment of the condensate supply system of the nuclear power plant as shown in fig. 1, a pneumatic valve 400 is provided on each water filling line 40, and a liquid level alarm device 402 is provided on the water filling line 40 between the pneumatic valve 400 and the outlet of the condensate pump 30. The liquid level alarm device 402 can not only actively detect a fault in advance (namely, the check valve 300 at the outlet of the condensate pump 30 is not tight or air leaks at the pipeline interface, so that air is introduced into the check valve 300), reduce the workload of daily ultrasonic water level measurement, but also judge whether the pipeline is introduced with air through oxygen content after passively waiting for starting the condensate pump 30.
The pneumatic valve 400 needs to be provided with an operating system, which includes a valve body, a pneumatic head, an air supply line, a valve on/off limit, a solenoid valve, a knob for main control operation, and the like. The air supply line is directly connected to the instrument compressed air distribution System (SAR) of the steam turbine plant, and a diaphragm isolation valve is provided to close the safety position of the pneumatic valve 400 in case of air loss. The solenoid valve is powered using a conventional island 48V power system (LCE) and the safety position of the pneumatic valve 400 is de-energized closed.
The pneumatic valve 400 is normally in a closed state, and after air enters from the upstream of the check valve 300, the liquid level alarm device 402 gives an alarm to remind the user that the pneumatic valve 400 needs to be opened for water filling before the condensate pump 30 is started. So set up, can initiatively detect the trouble in advance, guarantee that reserve condensate pump 30 is full of water and start, not only protected equipment, also can avoid the pipeline to break and arouse the low water level of oxygen-eliminating device.
The liquid level alarm device 402 for water level monitoring adopts a nuclear power 48V direct current power supply decoupling system (LCC) for power supply, and an AA (alarm signal indicator lamp) and an EC (computer logic input signal) for alarm prompt are additionally arranged at a main control so as to detect whether the pipe section is air inlet or not in advance in time, thereby achieving the purpose of active intervention before starting a condensate pump and reducing the risk of oxidation corrosion caused by oxygen-containing water entering a downstream pipeline.
Please refer to fig. 2 in particular, which is a schematic structural diagram of a second embodiment of the condensate supply system of the nuclear power plant of the present invention, which includes a condenser 10, an outlet main pipe 20, and three condensate pumps 30 connected in parallel between the condenser 10 and the outlet main pipe 20 through pipes, wherein a check valve 300 is disposed at a water outlet of each condensate pump 30, and the pipes between the check valve 300 and the water outlet of the condensate pump 30 are connected to a conventional island desalination water distribution System (SER) pipe network 50 through a water filling pipe 40.
For the utility model discloses the first embodiment of nuclear power station condensate water supply system, the utility model discloses the second embodiment of nuclear power station condensate water supply system has following advantage:
1. the normal pressure of the conventional island demineralized water distribution system is about 8.5bar, and the vacuum of about 75mbar exists in the condenser, so that the impact on the parts in the condensate pump can be reduced, and the service life of the condensate pump is ensured;
2. the conventional island desalted water distribution system is used for filling water, so that the phenomenon of shunting of water supply flow at the outlet of the condensate pump 30 is avoided, and the tripping signal of the condensate pump 30 caused by the reduction of the outlet pressure of the condensate pump 30 is avoided;
3. because the pipeline of the conventional island desalted water distribution system is arranged in the whole steam turbine plant, the access arrangement of the newly added water charging pipeline 40 is simpler.
Please refer to fig. 3 in particular, which is a schematic structural diagram of a third embodiment of the condensate supply system of the nuclear power plant of the present invention, including a condenser 10, an outlet main pipe 20, and three condensate pumps 30 connected in parallel between the condenser 10 and the outlet main pipe 20 through pipes, wherein a check valve 300 is disposed at a water outlet of each condensate pump 30, and the pipes between the check valve 300 and the water outlet of the condensate pump 30 are respectively connected to a conventional island desalination water distribution System (SER) pipe network 50 and the outlet main pipe 20 through a water filling pipe 40.
Referring to fig. 3, the water filling lines 40 connecting the conventional island desalination water distribution System (SER) pipe network 50 and the outlet header 20 are respectively provided with a manual valve 404, and the manual valve 404 is a valve type commonly used in a steam turbine system, i.e., a stop valve, and is normally in a closed state. So set up, can make things convenient for manual control to fill the water speed, increase the pressure differential around the valve, reduce the impact to condensate pump internals, improve condensate pump's life.
For the utility model discloses the first, the second embodiment of nuclear power station condensate water supply system, the utility model discloses the third embodiment of nuclear power station condensate water supply system has following advantage:
1. the newly added water filling pipeline 40 is respectively connected with a pipe network 50 of a conventional island demineralized water distribution System (SER) and an outlet main pipe 20, so that the selectivity in the use process can be increased, and the time interval from the alarm sent by the liquid level alarm device 402 to the actual water filling starting can be utilized for distinguishing: if the time interval is short, a conventional island demineralized water distribution system can be adopted for water filling; if the time interval is long, the outlet main pipe 20 connected with the three condensate pumps 30 is adopted for water filling;
2. the manual valves 404 are respectively arranged on the water filling pipelines 40 connecting the conventional island desalted water distribution System (SER) pipe network 50 and the outlet main pipe 20, so that the control of the water filling speed can be ensured, and the condensate pump 30 can be particularly protected from being impacted;
3. the manual valve 404 arranged on the water filling pipeline 40 connected with the outlet main pipe 20 can also reduce the shunting phenomenon of the outlet of the condensate pump 30;
4. filling water from the conventional island demineralized water distribution system, and adding deoxygenation to the condensed water to ensure the water quality of water supplied to downstream equipment by means of increasing the hydrazine injection amount in the outlet main pipe 20 of the condensed water pump 30;
5. the water filling from the conventional island demineralized water distribution system can also be used for pipeline flushing after the condensate pump 30 is overhauled, thereby shortening the construction period of the condensate pump 30 which is unavailable due to flushing.
The water filling process and steps of the third embodiment of the condensate supply system of the nuclear power plant according to the present invention will be described in detail with reference to fig. 3:
s1, determining that a standby condensate pump 30 needs to be started;
s2, the master control verifies whether the liquid level alarm device 402 at the outlet of the condensate pump 30 gives an alarm of over-low liquid level;
s3, calculating the time interval from the occurrence of the liquid level low alarm to the start of the standby condensate pump 30, and accordingly selecting to fill water by using a conventional island desalted water distribution system or three condensate pumps 30 and an outlet main pipe 20;
s4, the master control starts the pneumatic valve 400 of the water filling pipeline of the standby condensate pump 30;
s5, slowly filling water on site by opening the manual valve 404, and reducing impact on internal components of the condensate pump 30;
s6, if a conventional island demineralized water distribution system is adopted for filling water, a chemical department is required to increase the hydrazine adding amount of the two loops; if three condensate pumps 30 are adopted to fill water in the outlet main pipe 20, the pressure and the flow at the outlet of the condensate pump 30 need to be mainly controlled, and the shunting phenomenon is reduced;
s7, after the water filling is finished (the liquid level low alarm disappears), closing the manual valve 404 on site, and closing the pneumatic valve 400 by main control;
and S8, the main control starts the standby condensate pump 30, and pays attention to the oxygen content in the condensate and the vibration parameters of the condensate pump 30.
It can be understood that, in the embodiment of the condensate supply system of the nuclear power plant of the present invention shown in fig. 1 to 3, the condensate pump 30 is a caisson type vertical three-stage centrifugal pump, and the number thereof can be adjusted according to actual needs. For example, in the first to third embodiments of the condensate supply system of the nuclear power plant of the present invention, the number of the condensate pumps 30 is three, but in other embodiments of the condensate supply system of the nuclear power plant of the present invention, the number of the condensate pumps 30 may be three or more according to the actual use requirement.
According to the above principle, the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention are also intended to fall within the scope of the appended claims. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a nuclear power station condensate water supply system, includes condenser, the female pipe of export to and through pipeline parallel connection in three condensate pump between condenser and the female pipe of export, its characterized in that, the delivery port of every condensate pump is equipped with the check valve, the check valve with be connected with water filling pipeline on the pipeline between condensate pump's the delivery port.
2. The nuclear power plant condensate supply system of claim 1, wherein all three of the fill lines are connected to the outlet header.
3. The nuclear power plant condensate supply system of claim 1, wherein all three of the fill lines are connected to a conventional island demineralized water distribution system network pipe.
4. The condensate water supply system of the nuclear power plant as claimed in claim 1, wherein three of the water-filled lines are connected to the outlet header and a conventional island demineralized water distribution system network pipe, respectively.
5. The condensate supply system of nuclear power plant as claimed in claim 4, wherein manual valves are provided on the water filling lines connecting the outlet header and the network pipes of the conventional island demineralized water distribution system, respectively.
6. The condensate supply system of any one of claims 1 to 5, wherein a pneumatic valve is provided on each of the water fill lines.
7. The condensate water supply system of a nuclear power plant as claimed in claim 6, wherein a liquid level alarm device is provided on the water filling line between the pneumatic valve and the water outlet of the condensate pump.
8. The condensate water supply system of the nuclear power plant as claimed in claim 7, wherein the pneumatic valve is normally in a closed state, and the pneumatic valve is opened after the liquid level alarm device alarms.
9. The condensate supply system of any one of claims 1 to 5, wherein the water fill line is made of a stainless steel material.
10. The condensate supply system of any one of claims 1 to 5, wherein the condensate pump is a caisson-type vertical three-stage centrifugal pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221551840.3U CN217928734U (en) | 2022-06-21 | 2022-06-21 | Condensed water supply system of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221551840.3U CN217928734U (en) | 2022-06-21 | 2022-06-21 | Condensed water supply system of nuclear power station |
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| Publication Number | Publication Date |
|---|---|
| CN217928734U true CN217928734U (en) | 2022-11-29 |
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| CN202221551840.3U Active CN217928734U (en) | 2022-06-21 | 2022-06-21 | Condensed water supply system of nuclear power station |
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- 2022-06-21 CN CN202221551840.3U patent/CN217928734U/en active Active
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